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on the red planet. the "curiosity" rover has been collecting samples for months and nasa announced now that they do have evidence that there may have once been life on mars. >> well scientists studied rock samples from a 3 billion-year-old lake bed and say it was once filled with pure water. abc's brandi hitt has more. >> good morning, rob, and diana. scientists say this is huge. it didn't take "curiosity" long to find concrete evidence that life could have been supported on mars and this little rover is not done searching. only 7 months after its celebrated landing on mars, the "curiosity" rover has now answered a key question. yes, mars could have hosted life. >> this was an ancient environment with the right elements and slightly salty liquid water. all of the prerequisites to support life. >> probably if this water was around and you had been on the planet you would have been able to drink it. >> reporter: nasa made the startling discovery thanks to chemical analysis of a powder "curiosity" recovered by drilling a hole into a rock. it struck pay dirt. finding half a dozen key eleme
in hospital. >> reporter: malala will enter school in year 9. >> inspiring story. >>> the head of nasa calling for an early warning system to protect the country against meteors. but he says the government is not willing to pay for it. the nasa chief told lawmakers a meteor may have been deflected. infrared technology could have detected the meteor. currently there is not a whole lot we can do. >> if you detected even a small one like the one that detonated in russia, headed for new york city in three weeks. what would we do? >> the answer to you, if it's coming in three weeks, pray. >> experts warn the chances of a meteor catastrophe are slim. they say they are real. 10,000 small meteors within range capable of destroying heavily populated urban areas are out there. >>> now to a medical study that hits home for sleep deprived and stressed out right here at home. turns out they may make us at risk for obesity. colorado researchers discovered adults who got five hours of sleep a night gained weight almost immediately after cutting back on sleep. they ate 6% more food t
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